Conditional statements

In Python, conditional statements are used to determine if a specific condition is met by testing whether a condition is true or false. Conditional statements are used to determine how a program is executed. For example, conditional statements could be used to determine whether it is time to turn on the lights. The syntax is as follows:

if condition_is_true:

  do_something()

The condition is usually tested using a logical operator, and the set of tasks under the indented block is executed. Let's consider the example, check_address_if_statement.py (available for download with this chapter) where the user input to a program needs to be verified using a yes or no question:

check_address = input("Is your address correct(yes/no)? ") 
if check_address == "yes": 
  print("Thanks. Your address has been saved") 
if check_address == "no": 
  del(address) 
  print("Your address has been deleted. Try again")

In this example, the program expects a yes or no input. If the user provides...